""" 
CSDN : heart_6662
PYTHON amateur   
"""
x = [[12,7,3],
        [4,5,6],
        [7,8,9]]

y = [[5,8,1],
        [6,7,3],
        [4,5,9]]
z= []
for i in range(3):
    z.append([])
for i in range(3):
    for j in range(3):
        z[i].append(x[i][j]+y[i][j])
print (z)